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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 491 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.81² =
  2. 2.74² =
  3. 3.66² =
  4. 4.72² =
  5. 5.33² =
  6. 6.31² =
  7. 7.51² =
  8. 8.99² =
  9. 9.89² =
  10. 10.96² =
  11. 11.91² =
  12. 12.71² =
  13. 13.76² =
  14. 14.41² =
  15. 15.36² =
  16. 16.98² =
  17. 17.34² =
  18. 18.94² =
  19. 19.62² =
  20. 20.87² =
  21. 21.88² =
  22. 22.39² =
  23. 23.35² =
  24. 24.63² =
  25. 25.56² =
  26. 26.95² =
  27. 27.78² =
  28. 28.97² =
  29. 29.37² =
  30. 30.85² =
  31. 31.68² =
  32. 32.75² =
  33. 33.93² =
  34. 34.84² =
  35. 35.54² =
  36. 36.38² =
  37. 37.64² =
  38. 38.86² =
  39. 39.67² =
  40. 40.83² =

Answer key

  1. 6561
  2. 5476
  3. 4356
  4. 5184
  5. 1089
  6. 961
  7. 2601
  8. 9801
  9. 7921
  10. 9216
  11. 8281
  12. 5041
  13. 5776
  14. 1681
  15. 1296
  16. 9604
  17. 1156
  18. 8836
  19. 3844
  20. 7569
  21. 7744
  22. 1521
  23. 1225
  24. 3969
  25. 3136
  26. 9025
  27. 6084
  28. 9409
  29. 1369
  30. 7225
  31. 4624
  32. 5625
  33. 8649
  34. 7056
  35. 2916
  36. 1444
  37. 4096
  38. 7396
  39. 4489
  40. 6889

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